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diff --git a/src/libs/xpcom18a4/xpcom/io/nsStorageStream.h b/src/libs/xpcom18a4/xpcom/io/nsStorageStream.h
new file mode 100644
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+++ b/src/libs/xpcom18a4/xpcom/io/nsStorageStream.h
@@ -0,0 +1,98 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Communicator client code, released
+ * March 31, 1998.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998-1999
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+/*
+ * The storage stream provides an internal buffer that can be filled by a
+ * client using a single output stream.  One or more independent input streams
+ * can be created to read the data out non-destructively.  The implementation
+ * uses a segmented buffer internally to avoid realloc'ing of large buffers,
+ * with the attendant performance loss and heap fragmentation.
+ */
+
+#ifndef _nsStorageStream_h_
+#define _nsStorageStream_h_
+
+#include "nsIStorageStream.h"
+#include "nsIOutputStream.h"
+#include "nsMemory.h"
+
+#define NS_STORAGESTREAM_CID                       \
+{ /* 669a9795-6ff7-4ed4-9150-c34ce2971b63 */       \
+  0x669a9795,                                      \
+  0x6ff7,                                          \
+  0x4ed4,                                          \
+  {0x91, 0x50, 0xc3, 0x4c, 0xe2, 0x97, 0x1b, 0x63} \
+}
+
+#define NS_STORAGESTREAM_CONTRACTID "@mozilla.org/storagestream;1"
+#define NS_STORAGESTREAM_CLASSNAME "Storage Stream"
+
+class nsSegmentedBuffer;
+
+class nsStorageStream : public nsIStorageStream,
+                        public nsIOutputStream
+{
+public:
+    nsStorageStream();
+    
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSISTORAGESTREAM
+    NS_DECL_NSIOUTPUTSTREAM
+
+    friend class nsStorageInputStream;
+
+private:
+    ~nsStorageStream();
+
+    nsSegmentedBuffer* mSegmentedBuffer;
+    PRUint32           mSegmentSize;       // All segments, except possibly the last, are of this size
+                                           //   Must be power-of-2
+    PRUint32           mSegmentSizeLog2;   // log2(mSegmentSize)
+    PRBool             mWriteInProgress;   // true, if an un-Close'ed output stream exists
+    PRInt32            mLastSegmentNum;    // Last segment # in use, -1 initially
+    char*              mWriteCursor;       // Pointer to next byte to be written
+    char*              mSegmentEnd;        // Pointer to one byte after end of segment
+                                           //   containing the write cursor
+    PRUint32           mLogicalLength;     // Number of bytes written to stream
+
+    NS_METHOD Seek(PRInt32 aPosition);
+    PRUint32 SegNum(PRUint32 aPosition)    {return aPosition >> mSegmentSizeLog2;}
+    PRUint32 SegOffset(PRUint32 aPosition) {return aPosition & (mSegmentSize - 1);}
+};
+
+#endif //  _nsStorageStream_h_